EP3671953A1 - Monopolare draht-plattenantenne - Google Patents

Monopolare draht-plattenantenne Download PDF

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Publication number
EP3671953A1
EP3671953A1 EP19217247.6A EP19217247A EP3671953A1 EP 3671953 A1 EP3671953 A1 EP 3671953A1 EP 19217247 A EP19217247 A EP 19217247A EP 3671953 A1 EP3671953 A1 EP 3671953A1
Authority
EP
European Patent Office
Prior art keywords
short
magneto
antenna
dielectric material
ground plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19217247.6A
Other languages
English (en)
French (fr)
Inventor
Christophe Delaveaud
Lotfi Batel
Jean-François PINTOS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA, Commissariat a lEnergie Atomique et aux Energies Alternatives CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP3671953A1 publication Critical patent/EP3671953A1/de
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the invention relates to the technical field of monopolar wire-plate antennas.
  • the invention finds its application in particular in the Internet of Things IoT (acronym for " Internet of Things " in English), radio identification RFID (acronym for " Radio Frequency IDentification " in English), communication for networks of sensors, communication between M2M machines (“ Machine-to-Machine ” in English), communication in the fields of aeronautics and space.
  • IoT Internet of Things
  • RFID Radio Frequency IDentification
  • Such an antenna of the state of the art thanks to the magneto-dielectric material coating the short-circuit wire, can have dimensions reduced by around 15% compared to an architecture without magneto-dielectric material, and this while maintaining similar performance.
  • a monopolar wire-plate antenna architecture is sought which makes it possible to improve the miniaturization of the antenna, with an equal quantity of magneto-dielectric material.
  • such an antenna according to the invention makes it possible to improve the miniaturization of the antenna, with an equal amount of magneto-dielectric material, thanks to the paralleling of a plurality of short-circuit wires each coated with a magneto-dielectric material.
  • the inventors have found that, with an equal quantity of magneto-dielectric material, placing a set of short-circuit wires in parallel, each coated with a magneto-dielectric material, makes it possible to reduce the resonance frequency of the antenna to low frequencies by more than 30% compared to a single equivalent short-circuit wire, coated with a magneto-dielectric material.
  • the parallel connection of a set of short-circuit wires, each coated with a magneto-dielectric material allows better interaction between the antenna and the magneto-dielectric material, and therefore a better miniaturization efficiency of the antenna loaded by the magneto-dielectric material.
  • the antenna according to the invention may include one or more of the following characteristics.
  • the supply probe is arranged in the center of the ground plane, and the set of short-circuit wires comprises at least one pair of short-circuit wires arranged around the probe. feeding in a central symmetry.
  • an advantage obtained is to obtain a symmetry for the radiation of the antenna and to reduce the cross polarization (“ cross polarization ” in English language).
  • the set of short-circuit wires comprises a number of short-circuit wires chosen so that, for a given quantity of magneto-dielectric material, the capacitive roof and the supply probe each have a maximum characteristic dimension such that the antenna is contained in a sphere with an electric radius less than or equal to ⁇ / 2 ⁇ , where ⁇ is the operating wavelength of the antenna.
  • an advantage provided is to obtain a miniature antenna.
  • miniature is meant that the antenna is contained in a sphere (called Wheeler's), with an electric radius less than or equal to ⁇ / 2 ⁇ .
  • Wheeler's a sphere
  • the radius of the Wheeler sphere is the hypotenuse of the right triangle whose right angle is formed by the radius of the capacitive roof and by the height of the antenna, and which must be less than or equal to ⁇ / 2 ⁇ .
  • the supply probe is coated with the magneto-dielectric material.
  • an advantage provided is to increase the quantity of magneto-dielectric material in the antenna, and thereby the efficiency of the loading of the antenna with the magneto-dielectric material to reduce its dimensions.
  • the antenna comprises a magneto-dielectric layer extending between the ground plane and the capacitive roof so as to coat each short-circuit wire and the supply probe.
  • an advantage provided is the simplicity of manufacturing the antenna.
  • the capacitive roof and the ground plane delimit a cylindrical volume
  • the magneto-dielectric layer extends in all or part of the cylindrical volume.
  • cylindrical designates the shape of a cylinder whose surface is generated by a family of lines of the same direction (generatrices).
  • the cross section of the cylinder i.e. the intersection of the surface with a plane perpendicular to the direction of the generators
  • can be circular or quadrangular e.g. rectangular.
  • ⁇ r > ⁇ r > 1 makes it possible to favor a high ⁇ r over a high ⁇ r , because too high ⁇ r generally leads to a high concentration of the electromagnetic field in the antenna, with potential impedance matching problems, and thus leading to a loss of transfer of electromagnetic power (eg radiofrequency) in free space.
  • the monopolar wire-plate antenna interacts effectively with the magnetic properties of the material via the short-circuit wires, which gives it a specific magnetic behavior in the near field.
  • the magneto-dielectric material is chosen from Ni 0.5 Zn 0.3 Co 0.2 In 0.75 Fe 1.925 O 4 , Ni 0.76 Mn 0.24-x Co x Fe 2 O 4 with x between 0 and 0.04, and Ni 0.61 Zn 0.35 Co 0.04 Fe 1.98 O 4 .
  • an advantage provided by such materials is to verify ⁇ r > ⁇ r > 1.
  • the short-circuit wires are separated from the supply probe by a distance chosen to adapt the input impedance of the antenna to 50 ohms.
  • an advantage provided is to maximize the transfer of electromagnetic power.
  • Such a method according to the invention makes it possible to easily manufacture a monopolar wire-plate antenna, from a substrate made of a magneto-dielectric material which coats both the supply probe and the set of wires. short circuit.
  • interconnection hole (" via " in English) means a metallized hole for establishing an electrical connection between two interconnection levels.
  • the ground plane 1 can be made of a metallic material, such as copper.
  • the ground plane 1 can be circular, as illustrated in Figures 1 and 2 . However, other shapes can be envisaged for the ground plane 1, such as a rectangular shape (illustrated in figures 3 to 5 ) or square.
  • the ground plane 1 can be formed on a dielectric substrate (not shown). An opening is made in the ground plane 1 (and if necessary in the dielectric substrate) to allow the passage of the supply probe 3.
  • ground plane 1 It is possible to equip the ground plane 1 with components, for example a direct current circuit (DC), a radio frequency circuit (RF) or even a power supply battery, and this without altering the operation of the antenna.
  • DC direct current circuit
  • RF radio frequency circuit
  • the capacitive roof 2 has an electrically conductive, preferably metallic, flat surface.
  • the capacitive roof 2 advantageously extends parallel to the ground plane 1.
  • the term “parallel” is understood within the usual tolerances linked to the experimental conditions of formation of the elements of the antenna, and not as perfect parallelism in the mathematical sense ( geometric) of the term.
  • the capacitive roof 2 can have an inclination relative to the ground plane 1 as soon as a capacitive effect is created with the ground plane 1.
  • the angle of inclination formed between the capacitive roof 2 and the ground plane 1 is preferably less than or equal to 30 °.
  • the capacitive roof 2 thus creates a capacitive effect with the ground plane 1 making it possible to lower the resonant frequency of the antenna, or reduce the length of the monopole (ie the supply probe 3) for a given resonant frequency.
  • the capacitive roof 2 is preferably circular in shape, for example with a radius of the order of ⁇ / 11, where ⁇ is the operating wavelength of the antenna.
  • ⁇ is the operating wavelength of the antenna.
  • the radius of the capacitive roof 2 is of the order of 200 mm.
  • the capacitive roof 2 can be envisaged for the capacitive roof 2, such as a square, rectangular, elliptical, or even star shape.
  • the supply probe 3 is not in contact with the ground plane 1 so as to be electrically isolated from the ground plane 1.
  • the supply probe 3 can be made integral with the plane of ground 1 using a spacer (not shown) which is not electrically conductive.
  • the feed probe 3 advantageously extends perpendicular to the ground plane 1, and therefore perpendicular to the capacitive roof 2, in order to overcome the disturbance of the radiation pattern of the antenna by the ground plane 1.
  • the probe supply 3 can be connected to a central core 30, metallic, of a coaxial waveguide.
  • the feed probe 3 extends between the ground plane 1 and the capacitive roof 2, for example over a height of the order of ⁇ / 11, where ⁇ is the operating wavelength of the antenna.
  • VHF very High frequency band
  • the height of the supply probe 3 is of the order of 200 mm.
  • the feed probe 3 is preferably arranged in the center of the ground plane 1, as illustrated in Figures 1 to 5 .
  • the feed probe 3 is advantageously coated with the magneto-dielectric material 5, as illustrated in Figures 4 and 5 .
  • the supply probe 3 is intended to be connected to a transmission line allowing the guided propagation of electromagnetic waves (eg in the radio frequency field), the transmission line being able to be a coaxial supply cable or another guide of 'wave.
  • the set of short-circuit wires 4 preferably metallic, advantageously extends perpendicular to the ground plane 1, and therefore perpendicular to the capacitive roof 2.
  • the short-circuit wires 4 of the assembly are mutually parallel .
  • the set of short-circuit wires 4 advantageously comprises at least one pair of short-circuit wires 4 arranged around the supply probe 3 according to central symmetry.
  • the set of short-circuit wires 4 comprises a number (denoted N) of short-circuit wires 4 chosen so that, for a given quantity of magneto-dielectric material 5, the capacitive roof 2 and the supply probe 3 each have a maximum characteristic dimension such that the antenna is contained in a sphere with an electric radius less than or equal to ⁇ / 2 ⁇ , where ⁇ is the operating wavelength of the antenna.
  • each short-circuit wire 4 has a radius, noted a, and that each short-circuit wire 4 is separated by a distance, noted b, from the supply probe 3, the inventors have shown that the set of short-circuit wires 4 is equivalent to a single wire having a radius (called equivalent radius R eq ) verifying:
  • the inventors have found that, with an equal quantity of magneto-dielectric material 5, placing a set of N short-circuit wires 4 in parallel, each coated with a magneto-dielectric material 5, makes it possible to reduce the frequency of resonance of the antenna towards low frequencies of more than 30% compared to a single short-circuit wire 4, coated with the magneto-dielectric material 5, and having an equivalent radius R eq calculated by the preceding formulas.
  • putting in parallel a set of N short-circuit wires 4, each coated with a magneto-dielectric material 5 allows better efficiency of the antenna loading by the magneto-dielectric material 5.
  • a volume of magneto-dielectric material would be 20 times greater to reduce the resonant frequency of the antenna at low frequencies by more than 30 %, which would lead to substantial bulk, additional losses (linked to the quantity of additional material), and a higher weight of the antenna.
  • the set of short-circuit wires 4 may comprise three pairs of short-circuit wires 4 arranged around the supply probe 3 according to a central symmetry.
  • Each short circuit wire 4 can have a radius (a) of the order of 2.4 mm.
  • Each pair of short-circuit wires 4 can be separated by a distance (b) of the order of 80 mm on either side of the supply probe 3 according to a central symmetry.
  • the short-circuit wires 4 are advantageously separated from the supply probe 3 by a distance chosen to adapt the input impedance of the antenna to 50 ohms.
  • the set of short-circuit wires 4 may comprise an odd number of short-circuit wires 4. However, this may lead to an asymmetry for the radiation of the antenna and to the appearance of '' cross polarization ''.
  • the magneto-dielectric material 5 is advantageously chosen from Ni 0.5 Zn 0.3 Co 0.2 In 0.075 Fe 1.925 O 4 , Ni 0.76 Mn 0.24-x Co x Fe 2 O 4 with x between 0 and 0.04, and Ni 0.61 Zn 0.35 Co 0.04 Fe 1.98 O 4 .
  • the antenna advantageously comprises a magneto-dielectric layer 5 (made of magneto-dielectric material) extending between the ground plane 1 and the capacitive roof 2 so as to coat each short-circuit wire 4 and the probe d 'power 3.
  • the capacitive roof 2 and the ground plane 1 define a cylindrical volume, and the magneto-dielectric layer 5 extends in all or part of the cylindrical volume.
  • the magneto-dielectric material 5 can also be produced in the form of a hollow cylinder inside which extends a short-circuit wire 4 or the supply probe 3.
  • the interconnection holes 7a, 7b can be metallized by sputtering .
  • step e the set of short-circuit wires 4 and the supply probe 3 are coated with the magneto-dielectric material 5 of the substrate 6.

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  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP19217247.6A 2018-12-18 2019-12-17 Monopolare draht-plattenantenne Pending EP3671953A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1873167A FR3090220B1 (fr) 2018-12-18 2018-12-18 Antenne fil-plaque monopolaire

Publications (1)

Publication Number Publication Date
EP3671953A1 true EP3671953A1 (de) 2020-06-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19217247.6A Pending EP3671953A1 (de) 2018-12-18 2019-12-17 Monopolare draht-plattenantenne

Country Status (3)

Country Link
US (1) US11158947B2 (de)
EP (1) EP3671953A1 (de)
FR (1) FR3090220B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023006506A1 (fr) * 2021-07-27 2023-02-02 Commissariat A L'energie Atomique Et Aux Energies Alternatives Sonde de champ electromagnetique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3108209B1 (fr) * 2020-03-10 2022-02-25 Commissariat Energie Atomique Antenne fil-plaque monopolaire reconfigurable en fréquence
US11652290B2 (en) 2021-08-23 2023-05-16 GM Global Technology Operations LLC Extremely low profile ultra wide band antenna
US11901616B2 (en) * 2021-08-23 2024-02-13 GM Global Technology Operations LLC Simple ultra wide band very low profile antenna arranged above sloped surface

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US4695788A (en) * 1984-12-11 1987-09-22 Hughes Aircraft Company Open fault location system for photovoltaic module strings
FR2783115B1 (fr) * 1998-09-09 2000-12-01 Centre Nat Rech Scient Antenne perfectionnee
FR2826186B1 (fr) * 2001-06-18 2003-10-10 Centre Nat Rech Scient Antenne mulitfonctions integrant des ensembles fil-plaque
FR3030909B1 (fr) * 2014-12-19 2018-02-02 Commissariat A L'energie Atomique Et Aux Energies Alternatives Antenne fil-plaque ayant un toit capacitif incorporant une fente entre la sonde d'alimentation et le fil de court-circuit
US10205326B2 (en) * 2015-09-09 2019-02-12 Cpg Technologies, Llc Adaptation of energy consumption node for guided surface wave reception
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DELAVEAUD CH ET AL: "New kind of microstrip antenna: the monopolar wire-patch antenna", ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 30, no. 1, 6 January 1994 (1994-01-06), pages 1 - 2, XP006000050, ISSN: 0013-5194, DOI: 10.1049/EL:19940057 *
E.A. WOLFF: "Autenna anafysis", 1966, WILEY
JUHUA LIU ET AL: "Design and Analysis of a Low-Profile and Broadband Microstrip Monopolar Patch Antenna", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 61, no. 1, 23 August 2012 (2012-08-23), pages 11 - 18, XP011484563, ISSN: 0018-926X, DOI: 10.1109/TAP.2012.2214996 *
L. BATEL ET AL.: "Design of a monopolar wire-plate antenna loaded with magneto-dielectric material", CONFÉRENCE EUCAP (EUROPEAN CONFÉRENCE ON ANTENNAS AND PROPAGATION), April 2018 (2018-04-01)
L. BATEL ET AL: "Design of a Monopolar Wire-plate Antenna Loaded with Magneto-Dielectric Material", 12TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP 2018), 13 April 2018 (2018-04-13), Stevenage, UK, XP055626159, ISBN: 978-1-78561-816-1, DOI: 10.1049/cp.2018.1021 *
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023006506A1 (fr) * 2021-07-27 2023-02-02 Commissariat A L'energie Atomique Et Aux Energies Alternatives Sonde de champ electromagnetique
FR3125886A1 (fr) * 2021-07-27 2023-02-03 Commissariat A L'energie Atomique Et Aux Energies Alternatives Sonde de champ électromagnétique

Also Published As

Publication number Publication date
FR3090220B1 (fr) 2021-01-15
US20200203838A1 (en) 2020-06-25
FR3090220A1 (fr) 2020-06-19
US11158947B2 (en) 2021-10-26

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